Simply stated, the answer is yes you need to include both theoretical and conceptual frameworks in your dissertation. However, you need to know their differences and how each of them is used in a research study. Also you need to know the purposes and elements of each framework so that you can use them properly. In relation to these later issues, I recommend you to consult the following source.
Generally speaking, there are both conceptual as well as theoretical frameworks that are equally popular and used in both writing research papers and dissertations. The two concepts have an overlapping distribution which means there are both similarities and also differences between them. Primarily, theoretical framework is based upon theories that have already been substantiated. Such theories have resulted from research conducted earlier by other authors. On this basis, theoretical framework has a wider scope compared to conceptual framework. Nonetheless, it relies on multiple generalizations describing the connection between variables related to a given phenomenon. By contrast, conceptual framework differs from theoretical framework in that it provides a sign post indicating the direction of action in research . Alternatively, conceptual framework facilitates the implementation of research by identifying the input and output parameters underlying the research.
Hello, it is the school who will set the required components of the dissertation. Normally, the theoretical framework is required , for you to anchor your study on. it is the legal basis of your study. Some schools will also require the researcher to come up with his/her conceptual framework, to show the relationship of the variables of the study.